Portuguese (Portugal) · Pronunciation Guide
Say "kong SEH-duh" — "com" nasal, and "sede" has an open "eh" vowel with a near-silent final e.
The stress in this phrase falls on "SE" in "sede"; "com" is unstressed and nasal.
Listen: com sede
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Estou com muita sede.
I'm very thirsty.
Listen: Estou com muita sede.
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Like "com fome", "estar com sede" (to be thirsty) is a fixed noun-based idiom, literally "to be with thirst". "Estou com muita sede" uses "muita" (feminine, agreeing with "sede") rather than "muito", since "muito/a" as an adjective must agree with the noun it modifies — a subtle contrast with its invariable adverbial use (as in "muito bom"). This is a good sentence for noticing that distinction.
Beyond the same "estar com + noun" idiom trap as "com fome", learners frequently confuse "muito" (invariable adverb, "very") with "muita" (agreeing adjective, "a lot of") — since "sede" is feminine, it must be "muita sede", not "muito sede". On pronunciation, keep the vowel in "se" open like English "bed", avoiding a more closed vowel that could make it sound like a different word.